Finsler space–time can explain both parity asymmetry and power deficit seen in CMB temperature anisotropies. Issue 1 (28th June 2018)

• Record Type: Journal Article
• Authors: Chang, Zhe; Rath, Pranati K; Sang, Yu; Zhao, Dong; Zhou, Yong
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 479:Issue 1(2018)
• Page Start: 1327
• Page End: 1331
• Publication Date: 2018-06-28
• Subjects: cosmic background radiation -- cosmological parameters; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty1689
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We propose a framework of Finsler space–time to explain the observed parity asymmetry and the power deficit in the low-ℓ (2 ≤ ℓ ≤ 29) multipole range of cosmic microwave background (CMB) temperature anisotropies. In the 3 + 1 dimensional space–time, the three-dimensional space is described by a Randers-Finsler space, which is spatially irreversible, inducing the parity asymmetry in the CMB angular power spectrum. We estimate the constraints on the two parameters introduced by Finsler space–time via analysing the low-ℓ angular power spectrum in PLANCK 2015 CMB temperature data. We see that the low-ℓ power suppression in the CMB temperature anisotropies can also be resolved in this scenario. Our study shows that the two low-ℓ anomalies, i.e. parity asymmetry and power deficit, may have a common origin.